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RcppExamples (version 0.1.10)

RcppDataFrame: Rcpp::DataFrame example for Rcpp

Description

A DataFrame can be passed C++ and can be instantiated as a corresponding C++ object using the Rcpp API.

This example shows (in the corresponding C++ code) how to access, modify and create a data frame.

Arguments

Author

Dirk Eddelbuettel and Romain Francois

Details

Usage of Rcpp::DataFrame is fully defined in the respective header file.

The C++ source file corresponding to the this function does the following:


      // we receive a 'DF' data.frame object
      // and access each column by name
      Rcpp::IntegerVector a = DF["a"];
      Rcpp::CharacterVector b = DF["b"];
      Rcpp::DateVector c = DF["c"];
      
      // do something
      a[2] = 42;
      b[1] = "foo";
      c[0] = c[0] + 7;                      // move up a week

// create a new data frame Rcpp::DataFrame NDF = Rcpp::DataFrame::create(Rcpp::Named("a")=a, Rcpp::Named("b")=b, Rcpp::Named("c")=c);

// and return old and new in list return(Rcpp::List::create(Rcpp::Named("origDataFrame")=DF, Rcpp::Named("newDataFrame")=NDF));

Examples

Run this code
  if (FALSE) {
  RcppDataFrame()
  }

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